public ElGamalAbstractCipher(ElGamalKeyStruct p_key_struct)
{
o_key_struct = p_key_struct;
o_plaintext_blocksize = p_key_struct.getPlaintextBlocksize();
o_ciphertext_blocksize = p_key_struct.getCiphertextBlocksize();
o_block_size = o_plaintext_blocksize;
}
public ElGamalAbstractCipher(ElGamalKeyStruct p_key_struct)
{
// set the key details
o_key_struct = p_key_struct;
// calculate the blocksizes
o_plaintext_blocksize = p_key_struct.getPlaintextBlocksize();
o_ciphertext_blocksize = p_key_struct.getCiphertextBlocksize();
// set the default block for plaintext, which is suitable for encryption
o_block_size = o_plaintext_blocksize;
}
public ElGamalManaged()
{
// create the key struct
o_key_struct = new ElGamalKeyStruct();
// set all of the big integers to zero
o_key_struct.P = new BigInteger(0);
o_key_struct.G = new BigInteger(0);
o_key_struct.Y = new BigInteger(0);
o_key_struct.X = new BigInteger(0);
// set the default key size value
KeySizeValue = 1024;
// set the default padding mode
Padding = ElGamalPaddingMode.Zeros;
// set the range of legal keys
LegalKeySizesValue = new KeySizes[] { new KeySizes(384, 1088, 8) };
}
public ElGamalManaged()
{
// create the key struct and set all of the big integers to zero
o_key_struct = new ElGamalKeyStruct
{
P = BigInteger.Zero,
G = BigInteger.Zero,
Y = BigInteger.Zero,
X = BigInteger.Zero
};
// set the default key size value
KeySizeValue = 384;
// set the default padding mode
Padding = ElGamalPaddingMode.BigIntegerPadding;
// set the range of legal keys
LegalKeySizesValue = new[] { new KeySizes(384, 1088, 8) };
}
public ElGamalDecryptor(ElGamalKeyStruct p_struct)
: base(p_struct)
{
o_block_size = o_ciphertext_blocksize;
}
public ElGamalEncryptor(ElGamalKeyStruct p_struct)
: base(p_struct)
{
o_random = RandomNumberGenerator.Create();
}
public ElGamalDecryptor(ElGamalKeyStruct p_struct)
: base(p_struct)
{
// set the default block size to be ciphertext
o_block_size = o_ciphertext_blocksize;
}
public ElGamalEncryptor(ElGamalKeyStruct p_struct)
: base(p_struct)
{
o_random = new RNGCryptoServiceProvider();
}
